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394d998315
At least in neovim, `│vi:` is not recognized as a modeline because it has no preceding whitespace. After fixing this, opening a file yields an error because `net` is not an option. (`noet`, however, is.)
99 lines
3.9 KiB
C
99 lines
3.9 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi │
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/math.h"
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#include "libc/tinymath/ldshape.internal.h"
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#if !(LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024)
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asm(".ident\t\"\\n\\n\
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Musl libc (MIT License)\\n\
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Copyright 2005-2014 Rich Felker, et. al.\"");
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asm(".include \"libc/disclaimer.inc\"");
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// clang-format off
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#if LDBL_MANT_DIG == 64
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#define SPLIT (0x1p32L+1)
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#elif LDBL_MANT_DIG == 113
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#define SPLIT (0x1p57L+1)
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#endif
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static void sq(long double *hi, long double *lo, long double x)
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{
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long double xh, xl, xc;
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xc = x*SPLIT;
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xh = x - xc + xc;
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xl = x - xh;
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*hi = x*x;
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*lo = xh*xh - *hi + 2*xh*xl + xl*xl;
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}
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/**
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* Returns euclidean distance.
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*/
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long double hypotl(long double x, long double y)
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{
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union ldshape ux = {x}, uy = {y};
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int ex, ey;
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long double hx, lx, hy, ly, z;
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ux.i.se &= 0x7fff;
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uy.i.se &= 0x7fff;
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if (ux.i.se < uy.i.se) {
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ex = uy.i.se;
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ey = ux.i.se;
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x = uy.f;
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y = ux.f;
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} else {
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ex = ux.i.se;
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ey = uy.i.se;
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x = ux.f;
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y = uy.f;
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}
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if (ex == 0x7fff && isinf(y))
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return y;
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if (ex == 0x7fff || y == 0)
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return x;
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if (ex - ey > LDBL_MANT_DIG)
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return x + y;
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z = 1;
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if (ex > 0x3fff+8000) {
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z = 0x1p10000L;
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x *= 0x1p-10000L;
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y *= 0x1p-10000L;
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} else if (ey < 0x3fff-8000) {
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z = 0x1p-10000L;
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x *= 0x1p10000L;
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y *= 0x1p10000L;
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}
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sq(&hx, &lx, x);
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sq(&hy, &ly, y);
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return z*sqrtl(ly+lx+hy+hx);
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}
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#endif /* long double is long */
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